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Mathematics 21 Online
OpenStudy (anonymous):

a house price went from $138,400 to $141,168, By what percent did the value rise ?

OpenStudy (mathstudent55):

Before you get to the percent rise, how much did the price go up by?

OpenStudy (anonymous):

idk. can you answer that for me and what the percent is of how the value rised ?

OpenStudy (mathstudent55):

Can you do the subtraction 141,168 - 138,400 ? That is how much the price went up.

OpenStudy (anonymous):

ok

OpenStudy (anonymous):

then what is the percent it rised

OpenStudy (mathstudent55):

To find the percent, divide the part by the total and multiply by 100. In this case, find how much the price went up by subtracting 141,168 - 138,400. Then divide the result of that subtraction by 138,400 and multiply by 100.

OpenStudy (anonymous):

is it 0.5 % ??

OpenStudy (mathstudent55):

That's not what I got.

OpenStudy (mathstudent55):

Let's do it one step at a time together. What do you get for 141,168 - 138,400 ?

OpenStudy (anonymous):

2,768

OpenStudy (mathstudent55):

Correct. That's what I got. Now divide 2,768 by 138,400. What do you get?

OpenStudy (anonymous):

0.02

OpenStudy (mathstudent55):

Great. I got that two. Final step, multiply 0.02 by 100. This is your final answer as a percent.

OpenStudy (anonymous):

i have one more question i am going to ask you like the one we did please help

OpenStudy (mathstudent55):

The answer is 2%, by the way.

OpenStudy (mathstudent55):

sure go ahead

OpenStudy (anonymous):

a car production went from 3,000 to 2,850, by what percent has production decreased ?

OpenStudy (mathstudent55):

Here, we again subtract first. What is 3000 - 2850 ?

OpenStudy (anonymous):

150

OpenStudy (mathstudent55):

Great. Now, divide 150 by the original number, 3000.

OpenStudy (anonymous):

0.05

OpenStudy (mathstudent55):

Correct. Now multiply by 100 to get the percent change.

OpenStudy (anonymous):

is it 5% or -5% ?

OpenStudy (mathstudent55):

The percent change is -5%. The question is "by what percent has production decreased?" Since the question is already acknowledging the change is a decrease, the decrease is 5%. The change is -5%, the negative percentage denoting a decrease.

OpenStudy (anonymous):

do ypu know how to graph linear equations by 2 variables ?

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